* AscendedFanFic: "Adventure Time with Fionna and Cake" started out as a GenderFlip WhatIf comic by a character designer of the show, Natasha Allegri. Pen liked the drawings and decided to make an episode based off the idea. Her comic was itself inspired by RuleSixtyThree art of the cast from drawthreads on [[ImageBoards 4chan's /co/ board.]]

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* AscendedFanFic: "Adventure Time with Fionna and Cake" started out as a GenderFlip WhatIf comic by a character designer of the show, Natasha Allegri. Pen liked the drawings and decided to make an episode based off the idea. Her comic was itself inspired by RuleSixtyThree art of the cast from drawthreads on [[ImageBoards 4chan's Website/FourChan's /co/ board.]]

* CastFromSanity: The more Simon Petrikov uses the Ice Crown, the more he loses his mind and becomes dependent of it. The key moment where he lost most of his sanity and became the Ice King (or rather [[spoiler:an "Evergreen copy"]]) happened when [[spoiler:he used it to protect Marceline from a group of radioactive zombies]].

* {{Calvinball}}: The "Card Wars" episode features the Card Wars game, a holographic card game that parodies real life games such as Magic the Gathering and is overly convoluted, taking Jake two hours to teach it to Finn.-->'''Jake:''' I floop the pig.

* ColdTurkeysAreEverywhere: In "His Hero", Finn and Jake are persuaded by Billy that violence is not the answer and they swear to find non-violent ways to help people. They immediately run into situations where violence would be the perfect solution. They also discover that they suck at non-violent solutions.

* AbandonedCatchphrase: ''Adventure Time'' has a bunch of these from the first season:** The most famous and yet not used anymore is the TitleDrop (Jake asking ''"[[{{Tagline}} What time is it?]]"'' with Finn answering ''"ADVENTURE TIME!"''). During its short run it was played straight at first, then {{parodied|Trope}} (''"Party Time!", "Lauch Time"''), {{subverted|Trope}} (''"You know what time it is?" "...Adventure Time?"'') and even {{referenced|By}} in ''WesternAnimation/{{Futurama}}'' (''"[[Creator/JohnDimaggio Time for]] [[ActorAllusion you to]] [[TalkingToHimself shut up!]]"'').** Finn used to say "Mathematical!" and "Algebraic!" (a leftover from the PilotEpisode) but it was quickly forgotten. It is very unlikely to ever come back especially since the cancellation of its CompanionShow called ''Mathematical!'' due to it openly discussing HoYay after the episode "[[Recap/AdventureTimeS3E10WhatWasMissing What Was Missing]]".

* BrokenBird: Adventure Time seems to thrive on these kinds of people, of course the land of Ooo cant be completely saccharine.** The most significant example of them all though would have to be Marceline, from a extremely rough childhood of having to witness the apocalypse as a very young child, the other survivor who was her father figure got a case of magical Alzheimers and remembers nothing of his past relationship with Marceline. She had past fallout with Princess Bubblegum who is implied to be her girlfriend in the past, her LackOfEmpathy that she cant seem to fully control, and is implies to have self esteem issues and frightens people away so that people won't get to know her than abandon her, as the poor girl has had to go through pretty much her entire 1000 years of existence.

* CrapsackWorld: Ooo a post-apocalyptic land full of magical monsters ruled by royalty that range from innocent-but-crazy to outright evil. It was even worse during Marceline's childhood, which is implied to have been during or shortly after a world-ending nuclear war.

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* CrapsackWorld: Ooo Ooo, a post-apocalyptic land full of magical monsters ruled by royalty that range from innocent-but-crazy to outright evil. It was even worse during Marceline's childhood, which is implied to have been during or shortly after a world-ending nuclear war.

** There are times when Princess Bubblegum shows she's not as innocent (or sane) as she appears, like when she told Finn about the Paralysis Potion she made for no observable reason.

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** There are times when Princess Bubblegum shows she's not as innocent (or sane) as she appears, like when she told Finn about the Paralysis Potion she made for no observable reason. There are hints in later seasons that she was quite ruthless in the past. In season 7 episode 25, "The Thin Yellow Line", the Banana Guards fear her for this reason.

** The series actually [[{{Reconstruction}} reconstructs]] this trope by showing just why wishes tend to backfire when their made. Prismo tells Jake that it's because wish magic tends to follow ExactWords in execution and consequences can be avoided by being very specific in the wording.

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** The series actually [[{{Reconstruction}} reconstructs]] this trope by showing just why wishes tend to backfire when their they're made. Prismo tells Jake that it's because wish magic tends to follow ExactWords in execution and consequences can be avoided by being very specific in the wording.

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